I had a similar situation with my keys. I did have some spare locks, so I took the pins out of the worst ones and used them to rekey the 2 door locks. I just matched the 2 cylinders to the existing ignition key. I did not know about key numbers on the cylinders. Since my keys are pretty worn, I wanted to cut a clean new key from a blank, but haven't found anyone to do that. I did make some copies and they seem to work fine for now.
Sounds like you're pretty set up with the key kit now. Are you going to become the Squarebird locksmith? Just one more thing for you to do. ;-)